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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c709bf3e07e5577b781026af6a9a8e28fff06bc77d94a09ddec65ee4404ed982' 
  AND token = '2WrUkysNiGn36fjuZrq6Ryqt7f28fO/dBLHCpkAoyN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}